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Noisy Ferroli Combination Boiler?

PLEASE HELP! WE HAVE A VERY NOISY OPTIMAX 31 COMBINATION BOILER. IT MAKES A THUDDING SOUND WHEN IT REACHES TEMPERATURE AND FERROLI CANT FIX IT. THE BOILER RUNS ON LPG AND THE SOUND LASTS FOR AROUND 2 SECONDS AND CAN BE VERY LOUD! THANKS
Owen Lloyd, July 2008
Need more details but possibly pump problems

Elvis, July 2008
link Click here to see other fixes for Ferroli Optimax 31.